S&P 500 history shows strong post‑midterm performance
ITF Team1 min read
Since 1980 the index has posted an average 13.7% gain a year after midterm elections, with divided government delivering the best returns.
The market is nervously awaiting the U.S. midterm vote, but data from the past four decades suggests equities usually rally after the polls close. Across 11 midterm cycles since 1980, the S&P 500 has delivered an average 13.7% gain over the following 12 months, and the index rose after every single one of those elections.
Divided government drives higher returns
When the White House and at least one chamber of Congress are controlled by different parties, the index has posted the strongest one‑year performance – an average 15% rise, positive in 14 of 15 cases. By contrast, single‑party control yields a lower 11.5% average gain. Analysts note that balanced power reduces the risk of runaway fiscal spending and policy swings, which investors tend to favour.
What the data say about party swings
Large partisan waves – either a red or blue surge – have historically been less appealing to markets. In the three midterms where Democrats held both houses while a Republican occupied the White House (1986, 1990, 2006), the S&P 500 slipped 0.5% on election day, but recovered to +3.4% after a month and +10.9% after a year.
Factors beyond the ballot box
Even with a clear historical edge, elections are only one piece of the puzzle. Federal Reserve policy, corporate earnings and the ongoing AI-driven tech rally are seen as more decisive. The index’s worst post‑election year came after the 2000 vote, when the dot‑com bust erased 22.1% of value, while the best year followed the 2020 election, delivering a 38.3% gain as markets rebounded from pandemic lows.
What traders are watching next
- Key U.S. Treasury yields that could signal Fed tightening or easing
- Corporate earnings season, especially in AI‑related sectors
- Potential policy shifts if Democrats regain full control of Congress
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This article is compiled from international market news for information only. It is not investment advice.